Wecannottrusthimanymorebecauseheoften________hisduty.
A、owesThecollegestudentsinChinaare_______fromsmokingoncampusbecausethiswilldothemnogood.
Inordertoincreaseouroutput,weneedtoimportmoreproduction_______.
Freemedicalserviceis_______tonearlyallthecollegestudentsinChina.
Theengineersinthislabspentseveralweeks_______theirplansforthenewbicycle.
ProfessorSmithisalsothe_______oftheinternationalprogramoffice.Ifyouhaveanyproblemwhenyoustudyhere,youmaygotohimforhelp.
